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ahaaaaaa i totally forgot that point -.- Thanks alot sorry if i've been buggy bout it..youssef are u serious? that question is the easiest question in the paper.
Listen whenever u see a question that has ln or e: then u must know immediatly that these values can be equal to 0 when they are minimum.
In this case, as t progress to infinity, in other words as time becomes really large e^-0.05t becomes zero. Try it get ur calculator and put e^-.052(1x10^66) or something,
Since that is zero, then the only part of the equation left is the +25. So the temp can never go below 25. therefore it never reaches 20.